Window structure

ABSTRACT

Tilting double hung window construction, including a single plastic guide member at each side of a window sash for providing compression between a window frame and the window sash mounted therein and weatherstripping therebetween, as well as guiding the window sash in sliding movement relative to the frame and twopart pivoted camming and locking structure for securing the window sash in a tilted vertical position, especially in conjunction with counterbalance structure which is readily engageable with and releasable from the counterbalance structure. The window construction further includes unique single member glazing and mullion extrusions for facilitating glazing of the window structure and the sealing of window structures positioned side-by-side. Shipping clips for maintaining the frame of the window structure within predetermined limits during shipping and installing are also disclosed.

D United States Patent [151 3,643,377 Anderson [4 1 Well... m, 1972 [54] WINDOW STRUCTURE 3,212,225 10/1965 Neal ..52/498 X 3,299,596 1/1967 Neal et al..... [72] Inventor. Richard N. Anderson, Owensboro, 14y. 3,362123 H1968 Geyser n [73] Assignee: V. E. Anderson Mtg. (10., Owensboro, Ky. 3,399,490 9/1968 Hettinger ..49/ 176 X [22] Filed: Apr. 2, 1968 FOREIGN PATENTS OR APPLICATIONS [21] Appl. No.: 718,052 328,003 4/1958 Switzerland ..52/502 Related Application Dam Primary Examiner--Dennis L. Taylor [63] Continuation-impart Of Ser. NO. 634,169, Apr. 27, Ammekwhmemoree Hume" &

1967, P t. N 3,464,160.

57] ABSTRACT UeS- 49/181, double hung window constructian ine'uding a ingle 1 e e guide mgmber at each side ofa window 535]] f0 pray id- 1 Field ofsefllch e 1721430, 1761419, ing compression between a window frame and the window 5 502 sash mounted therein and Weatherstripping therebetween, as well as guiding the window sash in sliding movement relative 1 1 Refel'wcw Ciied to the frame and two-part pivoted camming and locking structure for securing the window sash in a tilted vertical position, UNITED STATES PATENTS especially in conjunction with counterbalance structure which 3,055,062 9/1962 Peters et a1. ..49/174 is readily engageable with and releasable from the counter- 3,146,501 9/1964 Peters ..49/174 balance Structure- 3434'236 3/1969 wedner ct 181 X The window construction further includes unique single 3,462,882 8/1969 Brown r "49/419 X member glazing and mullion extrusions for facilitating glazing 3A64J60 9/1969 Anderson "49/419 x of the window structure and the sealing of window structures 2,728,117 12/1955 PP F X positioned side-by-side. Shipping clips for maintaining the 2,917,790 12/1959 Espemchled "206/60 frame of the window structure within predetermined limits 3,108,335 10/ 1 963 Osten ..49/ 181 X during Shipping and installing are also disclosed 3,118,190 H1964 Love ..49/18l X 3,162,906 12/1964 Dudley ..52/470 X 4 Claims, 17 Drawing Figures w EUFEB 2 2 m2 SHEU 3 [1F 3 INVENTOR ATTORNEYS PWEWDFEM we 3, W337? sum w 3 INVENTOR FUCHARD N. ANDERSON ATTORNEYS winnow srnncrnnn CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation-impart of my copending application, Ser. No. 634,169, filed Apr. 27, 1967, now US. Pat. No. 3,464,160.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to tilting double hung windows and refers more specifically to a tilting double hung window having a single plastic guide member between the window sash and window frame at each side thereof for providing compression, Weatherstripping, and sash guiding functions, a two-part camming and locking structure for pivotally mounting the sash with respect to the guide member and window frame, unique glazing and mullion structure and packing clip structure for maintaining the window frame dimensions during shipment and installation.

2. Description of the Prior Art In the past tilting double hung windows of the type which may be cleaned from the inside of a building in which the window is installed by pivoting the window sash about one edge thereof to expose the outside surface for cleaning have been deficient in that the usual means for supporting the sash in the window frames have been rather complicated, often expensive, and sometimes inefficient. Thus, a minimum of three separate members, that is a metal guide for the sash, spring means operable between the window guide and metal frame for maintaining compression of the metal guide against the sash, and a felt member or similar Weatherstrip material between the sash and outer frame have usually been required at each side of the window sash.

Wherein locking structure has been provided in the past to maintain the sash of tilting double hung windows in a predetermined vertical position when tilted, the locking structure has been complicated, expensive to manufacture or inefficient. Further, the prior locking structures have not generally been readily engageable with and releasable from assembly with counterbalance structure for the sash.

Similarly, in the past, window sash have sometimes not been capable of being reglazed readily and where glazing has been possible, reglazing of a window sash has required considerable skill and special tools and material. Sealing between two adjacent windows has also been rather haphazard in the past, often amounting to merely packing calking material between the adjacent windows and providing flanges or the like to hide the calking material.

Again, in prior window structures wherein a sash is placed in a frame for shipment to and installing on a job site, the frames often become bowed or warped out of shape in storage, shipment or in installing, so that the finished window in place has in the past often been difficult to operate due to irregularities in the frame. Correction of the irregularities on the job site again requires considerable skill and is time consuming and therefore expensive.

In addition, prior window structures have generally been either metal or wood, that is, if a metal exterior has been required in the past for maintenance purposes, the interior of previous window structures has generally also been metal. Conversely, when a wooden window has been desired for aesthetic appearance and warmth, the entire window has usually been constructed of wood in the past. The interior aesthetic appearance and warmth of wood window structure has not previously been satisfactorily, combined with the maintenance advantages of metal exterior window structure.

SUMMARY OF THE INVENTION The invention is a tilting double hung window structure wherein a single plastic guide member is inserted in the frame at each side of the jarnbs and serves the multiple purposes of providing required compression between the frame and sash to maintain the sash in adjusted positions, guiding the sash in vertical movement and Weatherstripping between the sash and frame. The guide members in conjunction with unique twopart camming and locking structure further permit tilting of the sash into substantially any desired position with relative ease to facilitate cleaning of the windows. The window structure of the invention uses a minimum number or separate parts which parts are uniform where possible and are metal on the exterior and wood on the interior to provide weather resistance and aesthetic appearance.

The sash of the double hung window structure of the invention are reglazable to which end there is provided a unique single piece glazing member. In addition, the window structure of the invention may be installed side-by-side by use of a single, particularly efficient mullion strip. Further, the installation of the window structure is facilitated by the provision of packing and shipping clips during the manufacture of the window which maintain the frame dimensions with respect to the sash during storage, shipment and installation to prevent installation of the window with the frame deformed so as to hinder operation of the sash in the installed frame.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view of double hung window structure constructed in accordance with the invention having the sash in a closed position.

FIG. 2 is a perspective view of the double hung window structure of FIG. I showing the sash in a tilted position for cleaning or the like.

FIG. 3 is an enlarged broken longitudinal section view of the window structure illustrated in FIG. I taken substantially on the line 3-3 in FIG. I.

FIG. 4- is an enlarged broken transverse section view of the window structure illustrated in FIG. I taken substantially on the line d-d of FIG. 3.

FIG. 5 is an enlarged portion of the section view of FIG. 3, particularly showing the glazing strip for a sash head.

FIG. 6 is a broken section view of the window structure illustrated in FIG. 4 taken substantially on the line 6-6 in FIG. 4.

FIG. 7 is an enlarged, partial section view of the window structure of FIG. 6 taken substantially on the line 7-7 in FIG. 6.

FIG. 8 is a section view similar to the section view of FIG. 7 showing the window sash in a tilted position.

FIG. 9 is an exploded perspective view of the camming and locking structure of the window structure illustrated in FIG. I.

FIG. I0 is an elevation view of a pair of window structures as illustrated in FIG. I installed side-by-side.

FIG. II is an enlarged partial cross section view of the window structure illustrated in FIG. III taken substantially on the line II-II in FIG. Ill.

FIG. I2 is an enlarged section view of a portion of the window structure illustrated in FIG. II in a partly assembled condition, particularly showing the mullion strip for sealing between the window frames.

FIG. I3 is an interior elevation view of window structure, as illustrated in FIG. I, having packing and shipping clips assem bled therewith.

FIG. Id is an enlarged partial section view of the window structure illustrated in FIG. I3, taken substantially on the line I i-I4 in FIG. I35.

FIG. I5 is an enlarged partial cross section of window structure constructed in accordance with the invention, as shown in FIG. Ill, having an exterior packing and shipping clip secured thereto, taken substantially on the line I5-I5 in FIG. III.

FIG. I6 is a perspective view of the outside shipping and packing clip shown installed in FIG. 15.

FIG. I? is a perspective view of the inside packing and shipping clip shown installed in FIG. I43.

Ann

DESCRIPTION OF THE PREFERRED EMBODIMENT The window structure of the invention includes a window frame 12, a pair of window sash 14 and 16 and guide members 18 and 20. The frame 12 is metal, the sash 14 and 16 are wood, and the guide members 18 and 20 are plastic. The frame, sash and guide members when assembled, as illustrated in FIGS. 3 and 4, provide a tilting double hung window, the sash of which may be pivoted inwardly for cleaning or for subsequent tilting and removing as desired. In addition, as shown best in FIGS. 3 and 4, the window structure 10 combines the advantages of a metal exterior and a wood interior so that maintenance is kept at a minimum and the natural beauty of wood is preserved.

More specifically, the frame 12 includes the head member 22, the jamb members 24 and 26 and the sill member 28. The head and jamb members have a single cross section, as illustrated, including a mounting flange 30 to aid in installation of the window structure 10 in a building opening, an exterior molding portion 32 and portions 34, 36, 38 and 40 forming pockets 42 and 44 for receiving the guide members 18 and 20.

The sill member 28 includes the outwardly and downwardly inclined portion 46 and the portion 48 for securing the sill in a building opening. A water-stop portion 50 is provided on the cross section of the sill 48 and a molding receiving portion and sash stop member 52 is provided on the inside of the sill member 28. The head, jamb and sill members 22, 24 and 26 and28, as shown, may be mitered and connected by convenient comer structure (not shown).

The sash l4 and 16 are exactly the same and each includes head, jamb and sill members 54, 56, 58 and 60. The head, jamb and sill members are provided with recesses 62 in which glass panes or other building panels 64 are secured by means of the glazing member 66, as shown best in FIG. 5, in the case of single thickness glass panes. Insulated window panes 68 may also be secured in the recesses 62 in the sash, as shown in FIG. 3, by means of a glazing structure 70.

The glazing strip 66 is shown in more detail in FIG. 5 and has a generally U-shaped cross section with one leg longer than the other. The longer leg terminates in a pointed portion 68 extending outwardly from the longer leg of the cross section and away from the shorter leg of the cross section. The terminal portion 70 of the shorter leg of the cross section of the glazing strip 66 extends at an acute angle to the shorter leg toward the connecting portion of the U-shaped cross section and away from the longer leg thereof, again as shown in FIG. 5. The connecting portion of the U-shaped cross section of the glazing strip 66 terminates on the longer leg side of the cross section in a pointed portion 72 and extends outwardly of the U-shaped cross section from the shorter leg in a portion 74, again as shown in FIG. 5.

The particular cross section of the glazing strip 66 permits glazing of the sash 14 and 16 with glass panes or similar building panels having substantially varying thickness. Thus, the pointed portions 68 and 72 provide excellent weatherseals, the portion 70 is flexible to accommodate panels of different thickness and further provides a scaling function, while the portion 74 of the cross section of the glazing strip provides a finished appearance, even with building panels of considerably different thickness.

In use, as will be seen subsequently, the sill of the sash l4 and 16 is secured in place by means of screws passing through the camming and locking structure illustrated in FIGS. 6 through 9. Thus, in reglazing the sash l4 and 16, it is merely necessary to remove the glazing strips 66, remove the sill of the sash, place a new pane of glass in the recesses 62, replace the sill and press the glazing strip 66 into position around the sash in the recesses 62, as shown in FIG. 5.

At the bottom of both the sash member 14 and the sash member 16, as shown in FIG. 6, the camming and locking structure 76, which is best shown in FIG. 9, is provided to permit pivoting of the sash relative to the guide members 18 and 20 and the frame 12.

The camming and locking structure 76 includes the separate camming member 78 and locking member 80. The camming member 78 is secured to the sill of the sash, as shown in FIG. 6, by the portions 82 and 84 which are positioned a substantial distance apart on the base portion 86 of the camming member 78 and are adapted to be driven into the sills in the position shown in FIG. 6. The cylindrical portion 88 of the camming member 78 of the camming and locking structure is provided to react against a portion of the guide members as shown in FIG. 8, on tilting of the sash to which it is secured. The opening 90'is provided in the other errd of the cylindrical portion 88 of the camming member 78 to receive the mounting screw 92 by which the locking member 80 of the camming and locking structure 76 is secured to the camming member 78, the camming and locking structure 76 is secured to the sash and the sill of the sash is secured to the jambs thereof.

The locking member 80 of the camming and locking structure 76, as shown in FIG. 9, is an elongated member having an opening 94 in one end thereof with an outer enlarged diameter for receiving the head of the screw 92 and a reduced inner diameter fitting over the bearing portion 96 of the cylindrical portion 88 of the camming member 78, whereby the locking member 80 is pivoted to the camming member 78. The cylindrical extension 98 of the locking member 80 permits ready connection of the camming and locking structure to the window counterbalance structure 100, as shown in FIG. 6, by means of the hook 102 which may be readily engaged and disengaged therefrom should it be desired to remove the sash 14 or 16 from the frame 12. Serrated edges 104 are provided on the locking member 80 of the camming and locking structure 76, whereby on tilting of the sash, as shown in FIG. 8, so that the camming member 78 engages one portion of the guide strips, the serrations are forced into engagement with an adjacent portion to lock the sash in a predetermined vertical position during tilting thereof.

The guide members 18 and 20 are constructed of a resilient plastic, such as a semirigid vinyl, nylon or the like. The guide members have a cross section illustrated best in FIG. 4, including a pair of longitudinally extending recesses 106 and 108 for receiving the camming and locking structure 76. The members l8 and 20 are further provided with lesser recesses 110 and 112 for receiving the edge portions 114 and 116 of the jambs of the sash 14 and 16, whereby the sash are guided in vertical movement within the frame 12, as previously in-' dicated.

The arcuate resilient portions 118, 120 and 122 of the guide members 18 and 20 extend into the pockets 42 and 44, as shown, and tend to urge the members 18and 20 out of the pockets 42 and 44 and into engagement with the jambs of the sash l4 and 16. The direction in which the arcuate portions 118, 120 and 122 are bent and the resiliency thereof provide weathertight window structure between the frame 12 and sash l4 and 16.

The frame portions 36 and 38 are provided with projections 124 and 126 thereon extending into the pocket 42 which mate with abutrnents 128 and 130 on the portions 118 and 120 of the guide members 18 and 20 to maintain the guide members 18 and 20 within the pocket 42. Similar projections 132 can be provided on the portion 40 of the frame jambs 24 and 26 and on the portions 122 of the guide members 18 and 20.

Locking structure 134 is provided operable between the sashes l4 and 16 in the closed position and Weatherstripping 136 and 138 is provided as desired to maintain a weathertight window.

The window structure 10 is completed by the wood interior molding 140 secured over the portions 40 and 52 of the head, jamb and sill members 22, 24, 26 and 28 of the frame, as shown in FIGS. 3 and 4.

In overall operation, with the locking structure 134 unlocked, the inner sash 14 may be grasped by the head and pulled inwardly to pivot about the camming and lock structure 76 at the bottom thereof on forcing of the portion of the guide ant? members lb and Illti supported primarily by the portions inwardly of the pockets dd. Thus, either surface of the window pane bill may be exposed on the inside of the window structure lld for cleaning or the like, as shown in MG. n lowering the upper sash lib, the head of the upper sash lib may be gripped and the upper sash pivoted about the carnming and locking structure 76 adjacent the bottom thereof to urge the portion of the guide members Elli and 2b supported primarily by portions lllb and Mid into the pockets d2. Again then both sur faces of the window pane M- in the upper sash in may be exposed for cleaning or the like on the inside of the window structure llti.

With the windows in the tilted position, as shown in Flt It, they may be further inclined so that one side is raised higher than the other, whereby the camming and locking structure as may be removed from the recesses lltln and lilili and the sash lid and lb completely removed from the window structure id for replacing, repairing or the like.

Conversely, when it is desired to close the window structure ill], the sash are first placed in the frame lit with the loclring and camming structure '76: in the recesses lllllti and lllib to provide a horizontal pivot axis for the sash, and the sash is then pivoted back into the vertical position with the guide portions llld and lllti of the sash within the recesses ii iii and T12 of the guide members iii and 2b. The lower sash may then be moved all the way to the bottom, as illustrated in Fit]. 3", the upper sash may be moved all the way to the top and the locking structure in? latched, whereby the bottom of the lower sash is secured due to the camming and locking structure "7b. The top of the lower sash and the bottom of the upper sash are secured due to the pivot pins adjacent the bottom of the upper sash and the latch structure llfid and the head of the upper sash is secured due to the placing of the head of the sash of the pocket in the head member.

When it is desired to install two of the double hung tilting window structures lli side by side, as illustrated in Fill lit, the installation may be rapidly accomplished in a watertight manner by use of the mullion strip lldit, illustrated best in FlGS. ill and 112. The mullion member bill has a cross section, as shown in H6. M, which is generally it'll-shaped having the crossbar portion lldd and the opposite end portions ll llb and lid-ii. The end portion lldti is terminated with portions extending inwardly toward each other and terminating in points, while the end portion ll lil is outwardly concave, as shown in lFlG. T2.

In installation, the first window structure lid, for example the window at the left side in FlGS. llil, Jill and i2, is installed in the usual manner after the mounting flange .iltl, m shown best in MG. d, has been partly broken off. The end portion lldti of the l'lshaped cross section of the mullion member M2 is then engaged with the remainder of the mounting flange of the left window ill, as shown in PEG. llli. Subsequently, the remainder of the broken off mounting flange of the right hand window structure id, as shown in l lti. Til, is inserted in the end portion lldil ol the lit-shaped cross section of the mullion member M2 and the window structures iii are urged together, while the second window lid is fixed in place.

Due to the configuration of the cross section of the lishaped mullion strip M2, including the pointed end portions Mn and the concave outward end portions lid-ii which at their closest point are closer together than the width of the crossbar ldd, the mullion strip snugly engages both brolren otf mounting flanges of the windows iii in assembly, as illustrated in MG. ll, to provide a watertight vertical barrier for the window structures in side-by-side installation.

it will be understood that additional windows may be similarly installed and that if it is desired to install a pair or more windows at angles, such as and 45 with respect to each other, such installation can be accomplished with mullion strips similar to mullion strip Mil and, for example, i shaped mullion members having the desired angle positioned between the windows.

in shipment of the double hung tilting window structure it), it is particularly desirable to maintain the theme in a predetcrmined relation to the sash so that when the window structure ill is installed, the proper compression will be applied to the sash by the guide strips lb and 2b to permit easy movement of the sash. in accordance with the invention, the dimension between the frame l2 and the sash M and lie is maintained by the exterior packing and shipping clip T52 and the interior packing and shipping clip lfid, as shown best in M63. lb and M, respectively.

The exterior packing clip T52 includes the Hat portion T56 adapted to extend horizontally of the window structure illustrated in lFllG. litli in position thereon and having the nailing opening ifiil extending therethrough. The flat portion lltiil of the clip extends perpendicular to the portion M5 and is terminated in a sharp flange M2 on one side, as shown in FlG. to.

in installation, as shown in H6. llfi, the sharp flange T62 of the packing clip is inserted in the recess ilbd extending longitudinally of the frame jambs llbfil and the flat part T56 of the clip is placed in surface to surface engagement with the bottom surface of the sill of the upper sash lid in the upper position thereof and is secured in place by convenient means, such as nail lltid. The frame i2. is thus not allowed to bow outwardly of the sash.

The packing and shipping clip includes the three relatively perpendicularly flat portions lldti, lli'd and 1172, connected as shown in FIG. T7. The plane T72; is substantially triangular and the plane ll'ltl includes a fastener notch ll7d extending thereinto from one edge thereof. Rectilinear portion Wti extends in the plane of portions led and T of the clip 315 i and through the plane of portion T72 thereof at the intersection of the planes, as shown. The portion ms of the clip llb'd terminates in a flange llTti extending at right angles thereto.

in use, as shown best in HG. lid, the interior packing and shipping clip TM is positioned with the portions ildii and T70 in surface to surface engagement with the inside of the jamb of the sash lid and the surface lldtl of the wood molding ll llil with the rectilinear portion T76 positioned between the jamb and molding and the flange T78 engaging the jamb, as shown in FIG. lid. The clip is then secured in place by fastening means, such as the nail M2. The sash lid and the frame 12 are thus rigidly secured in predetermined relation for shipment and storage to insure proper installation.

ll bile one embodiment of the present invention has been considered in detail, it will be understood that other embodi ments and modifications are contemplated by the inventor.

What ll claim as my invention is:

T. Window structure comprising a frame including jamb members, at least one sash received in said frame having jamb members, a single resilient guide member positioned between the frame jamb and sash jamb on at least one side of the window structure and pivot structure operable between the sash jamb and resilient guide member for securing the sash in the frame for pivoting about a pivot axis including a separate cam member and a separate lock member pivotally mounted on the cam member, said cam member of the pivot structure including a camn'ling surface eccentric with respect to the pivot axis of the sash engageable with a portion of the guide member on pivoting of the sash and a bearing portion for receiving the loch member, said lock member being an elongated member having an opening extending therethrough for receiving the bearing portion of the cam member, and including grooves in the opposite edges thereof engageable with the guide member on pivoting of the sash, and a portion extending inwardly toward the cam member with the lock member pivotally mounted on the cam member for receiving one end of a counterbalance or the lilre.

Z. ill/indow structure comprising a frame including jamb members, at least one sash received in said irame having jamb members, a single member resilient guide member positioned between the frame jamb and sash jamb on at least one side of the window structure for providing weather stripping between the frame jamb and sash jamb, holding the sash jamb in compression and guiding the sash jamb, and pivot structure operable between the sash jamb and resilient guide member including a cam member secured to the sash jamb having an oblong portion extending in length longitudinally of the sash jamb adjacent the bottom thereof, means for securing the oblong portion to the sash jamb, a cylindrical bearing portion at one end of the oblong portion and an arcuate camming portion at the other end of the oblong portion, and a lock member positioned in the guide member securing the sash in the frame for pivoting about a pivot axis and including means operable therebetween for urging the lock member transversely of the plane of the sash in a closed position into engagement with the guide member to secure the sash in a fixed vertical position on tilting of the sash.

3. Structure as set forth in claim 2 wherein the lock member is an elongated member having an opening at one end extending therethrough having an axis of generation substantially in the plane of the window structure, grooves on the sides thereof radially outwardly of the opening therethrough for engagement with the guide member on movement of the locking member transversely of the window structure and means at the other end thereof for securing the lock member to a sash counterbalance.

4. Structure as set forth in claim 3 wherein the means for securing the lock member to a sash counterbalance comprises a cylindrical portion extending from said other end of the lock member toward the sash with the lock member positioned within the guide member in assembly with the cam member. 

1. Window structure comprising a frame including jamb members, at least one sash received in said frame having jamb members, a single resilient guide member positioned between the frame jamb and sash jamb on at least one side of the window structure and pivot structure operable between the sash jamb and resilient guide member for securing the sash in the frame for pivoting about a pivot axis including a separate cam member and a separate lock member pivotally mounted on the cam member, said cam member of the pivot structure including a camming surface eccentric with respect to the pivot axis of the sash engageable with a portion of the guide member on pivoting of the sash and a bearing portion for receiving the lock member, said lock member being an elongated member having an opening extending therethrough for receiving the bearing portion of the cam member, and including grooves in the opposite edges thereof engageable with the guide member on pivoting of the sash, and a portion extending inwardly toward the cam member with the lock member pivotally mounted on the cam member for receiving one end of a counterbalance or the like.
 2. Window structure comprising a frame including jamb members, at least one sash received in said frame having jamb members, a single member resilient guide member positioned between the frame jamb and sash jamb on at least one side of the window structure for providing weather stripping between the frame jamb and sash jamb, holding the sash jamb in compression and guiding the sash jamb, and pivot structure operable between the sash jamb and resilient guide member including a cam member secured to the sash jamb having an oblong portion extending in length longitudinally of the sash jamb adjacent the bottom thereof, means for securing the oblong portion to the sash jamb, a cylindrical bearing portion at one end of the oblong portion and an arcuate camming portion at the other end of the oblong portion, and a lock member positioned in the guide member securing the sash in the frame for pivoting about a pivot axis and including means operable therebetween for urging the lock member transversely of the plane of the sash in a closed position into engagement with the guide member to secure the sash in a fixed vertical position on tilting of the sash.
 3. Structure as set forth in claim 2 wherein the lock member is an elongated member having an opening at one end extending therethrough having an axis of generation substantially in the plane of the window structure, grooves on the sides thereof radially outwardly of the opening therethrough for engagement with the guide member on movement of the locking member transversely of the window structure and means at the other end thereof for securing the lock member to a sash counterbalance.
 4. Structure as set forth in claim 3 wherein the means for securing the lock member to a sash counterbalance comprises a cylindrical portion extending from said other end of the lock member toward the sash with the lock member positioned within the guide member in assembly with the cam member. 